Oops. No, no margin was intended in the stock market - that's a way to get badly burned. But I made the same mistake on the house price increase, so it works out. Just replace "10%" with "20%" and the rest should be right.

> A $50,000 investment growing at 7% annually would be worth approximately $200k after 20 years. In comparison, a $500k house would be worth about $750k with a balance of $240k remaining, assuming 2% inflation and a 7% interest rate on a 30-year note.

But why do you assume that stocks are going up 7% and housing is only going up 2%? (I assumed that houses went up the same amount as stocks, which may not be historically accurate. But only going up a third as much as stocks seems quite low.)